My big debate is over...
5680 = 4 pin Firewire
8890 = 6 pin Firewire

A 6 pin Firewire connnection means I don't have to worry about getting power to an external memory card reader.
Heh, I like to be diffrent.

Still there are other factors for me. I am looking at a Sager for use with Image prossessing, mostly Photoshop. Hypertherading as well as the faster FSB and RAM are major pluses for me. Both systems will have those fetures so there is no issue in that regard. RAID would cost me more money, that I don't have, so it is not even up for consideration.
What the actual screens will be like is something that keeps me wondering. Untill it is ready to be ordered we won't know for sure what will be on the systems. I liked the UXGA "Wide Angles" display on the 5670 a lot. It is quite likely that I will have someone looking over my shoulder when I am working on the laptop out in the field on a shoot. I would like to have a screen with good viewing angles so I will have less "off center looks off exposure" viewing.
M-10, Pish! I'd have no problems using the M-9. I will undoubtly play games on this laptop but there is a limit on how high of a resolution I "need" to be able to play a game. I need power for Phtotography not for games so as long as the video card is not shared memory I am basicly happy. Although I am kinda sorta looking forward to HL2

Cost is allways a factor but, we just have to wait and see on that.
In the end I may end up getting the 4670. The 17" screen makes for a nice professional presentation and it is good enough for me at the moement, then again anything would be considering my current system is a P3 450.

It is actualy below the minimum recomended specs to run my photo printer much less Photoshop.